/* FileSaver.js
 * A saveAs() FileSaver implementation.
 * 1.3.2
 * 2016-06-16 18:25:19
 *
 * By Eli Grey, http://eligrey.com
 * License: MIT
 *   See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
 */

/*global self */
/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */

/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */

var saveAs =
	saveAs ||
	(function (view) {
		'use strict';
		// IE <10 is explicitly unsupported
		if (
			typeof view === 'undefined' ||
			(typeof navigator !== 'undefined' && /MSIE [1-9]\./.test(navigator.userAgent))
		) {
			return;
		}
		var doc = view.document,
			// only get URL when necessary in case Blob.js hasn't overridden it yet
			get_URL = function () {
				return view.URL || view.webkitURL || view;
			},
			save_link = doc.createElementNS('http://www.w3.org/1999/xhtml', 'a'),
			can_use_save_link = 'download' in save_link,
			click = function (node) {
				var event = new MouseEvent('click');
				node.dispatchEvent(event);
			},
			is_safari = /constructor/i.test(view.HTMLElement) || view.safari,
			is_chrome_ios = /CriOS\/[\d]+/.test(navigator.userAgent),
			throw_outside = function (ex) {
				(view.setImmediate || view.setTimeout)(function () {
					throw ex;
				}, 0);
			},
			force_saveable_type = 'application/octet-stream',
			// the Blob API is fundamentally broken as there is no "downloadfinished" event to subscribe to
			arbitrary_revoke_timeout = 1000 * 40, // in ms
			revoke = function (file) {
				var revoker = function () {
					if (typeof file === 'string') {
						// file is an object URL
						get_URL().revokeObjectURL(file);
					} else {
						// file is a File
						file.remove();
					}
				};
				setTimeout(revoker, arbitrary_revoke_timeout);
			},
			dispatch = function (filesaver, event_types, event) {
				event_types = [].concat(event_types);
				var i = event_types.length;
				while (i--) {
					var listener = filesaver['on' + event_types[i]];
					if (typeof listener === 'function') {
						try {
							listener.call(filesaver, event || filesaver);
						} catch (ex) {
							throw_outside(ex);
						}
					}
				}
			},
			auto_bom = function (blob) {
				// prepend BOM for UTF-8 XML and text/* types (including HTML)
				// note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
				if (
					/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(
						blob.type
					)
				) {
					return new Blob([String.fromCharCode(0xfeff), blob], {
						type: blob.type,
					});
				}
				return blob;
			},
			FileSaver = function (blob, name, no_auto_bom) {
				if (!no_auto_bom) {
					blob = auto_bom(blob);
				}
				// First try a.download, then web filesystem, then object URLs
				var filesaver = this,
					type = blob.type,
					force = type === force_saveable_type,
					object_url,
					dispatch_all = function () {
						dispatch(filesaver, 'writestart progress write writeend'.split(' '));
					},
					// on any filesys errors revert to saving with object URLs
					fs_error = function () {
						if ((is_chrome_ios || (force && is_safari)) && view.FileReader) {
							// Safari doesn't allow downloading of blob urls
							var reader = new FileReader();
							reader.onloadend = function () {
								var url = is_chrome_ios
									? reader.result
									: reader.result.replace(/^data:[^;]*;/, 'data:attachment/file;');
								var popup = view.open(url, '_blank');
								if (!popup) view.location.href = url;
								url = undefined; // release reference before dispatching
								filesaver.readyState = filesaver.DONE;
								dispatch_all();
							};
							reader.readAsDataURL(blob);
							filesaver.readyState = filesaver.INIT;
							return;
						}
						// don't create more object URLs than needed
						if (!object_url) {
							object_url = get_URL().createObjectURL(blob);
						}
						if (force) {
							view.location.href = object_url;
						} else {
							var opened = view.open(object_url, '_blank');
							if (!opened) {
								// Apple does not allow window.open, see https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/WorkingwithWindowsandTabs/WorkingwithWindowsandTabs.html
								view.location.href = object_url;
							}
						}
						filesaver.readyState = filesaver.DONE;
						dispatch_all();
						revoke(object_url);
					};
				filesaver.readyState = filesaver.INIT;

				if (can_use_save_link) {
					object_url = get_URL().createObjectURL(blob);
					setTimeout(function () {
						save_link.href = object_url;
						save_link.download = name;
						click(save_link);
						dispatch_all();
						revoke(object_url);
						filesaver.readyState = filesaver.DONE;
					});
					return;
				}

				fs_error();
			},
			FS_proto = FileSaver.prototype,
			saveAs = function (blob, name, no_auto_bom) {
				return new FileSaver(blob, name || blob.name || 'download', no_auto_bom);
			};
		// IE 10+ (native saveAs)
		if (typeof navigator !== 'undefined' && navigator.msSaveOrOpenBlob) {
			return function (blob, name, no_auto_bom) {
				name = name || blob.name || 'download';

				if (!no_auto_bom) {
					blob = auto_bom(blob);
				}
				return navigator.msSaveOrOpenBlob(blob, name);
			};
		}

		FS_proto.abort = function () {};
		FS_proto.readyState = FS_proto.INIT = 0;
		FS_proto.WRITING = 1;
		FS_proto.DONE = 2;

		FS_proto.error =
			FS_proto.onwritestart =
			FS_proto.onprogress =
			FS_proto.onwrite =
			FS_proto.onabort =
			FS_proto.onerror =
			FS_proto.onwriteend =
				null;

		return saveAs;
	})(
		(typeof self !== 'undefined' && self) ||
			(typeof window !== 'undefined' && window) ||
			this.content
	);
// `self` is undefined in Firefox for Android content script context
// while `this` is nsIContentFrameMessageManager
// with an attribute `content` that corresponds to the window

if (typeof module !== 'undefined' && module.exports) {
	module.exports.saveAs = saveAs;
} else if (typeof define !== 'undefined' && define !== null && define.amd !== null) {
	define('FileSaver.js', function () {
		return saveAs;
	});
}
